A method for colouring hair. The method comprises the formation of a first plurality of coated hair fibre portions by applying a first composition to a first plurality of hair fibre portions and subsequently styling the hair. The first plurality of coated hair fibre portions is contacted with a second plurality of coated hair fibre portions but does not comprise the application of a solid barrier means in order to separate the first plurality of coated hair fibre portions from the second plurality of coated hair fibre portions. The composition comprises from about 0.2% to about 20% of viscosity-increasing agent and the viscosity-increasing agent is selected from the group consisting of: clays polysaccharides silicas block copolymers of polypropylene oxide (PPO) and polyethylene oxide (PEO) and mixtures thereof. Also provided are a hair colouring composition being in ready to use form, the use of the composition, a developing formulation, and a process for creating a hair colouring composition.
